[CII] line intensity mapping the epoch of reionization with the Prime-Cam on FYST

Abstract

We predict the three-dimensional intensity power spectrum (PS) of the [CII] 158$\mu$m line throughout the epoch of (and post) reionization at redshifts from $\approx$ 3.5 to 8. We study the detectability of the PS in a line intensity mapping (LIM) survey with the Fred Young Submillimeter Telescope (FYST). We created mock [CII] tomographic scans in redshift bins at $z\approx$ 3.7, 4.3, 5.8, and 7.4 using the Illustris TNG300-1 $\Lambda$CDM simulation and adopting a relation between the star formation activity and the [CII] luminosity ($L_{[CII]}$) of galaxies. A star formation rate (SFR) was assigned to a dark matter halo in the Illustris simulation in two ways: (i) we adopted the SFR computed in the Illustris simulation and, (ii) we matched the abundance of the halos with the SFR traced by the observed dust-corrected ultraviolet luminosity function of high-redshift galaxies. The $L_{[CII]}$ is related to the SFR from a semi-analytic model of galaxy formation, from a hydrodynamical simulation of a high-redshift galaxy, or from a high-redshift [CII] galaxy survey. The [CII] intensity PS was computed from mock tomographic scans to assess its detectability with the anticipated observational capability of the FYST. The amplitude of the predicted [CII] intensity power spectrum varies by more than a factor of 10, depending on the choice of the halo-to-galaxy SFR and the SFR-to-$L_{[CII]}$ relations. In the planned $4^{\circ }\times 4^{\circ }$ FYST LIM survey, we expect a detection of the [CII] PS up to $z\approx$ 5.8, and potentially even up to $z\approx$ 7.4. The design of the envisioned FYST LIM survey enables a PS measurement not only in small (<10 Mpc) shot noise-dominated scales, but also in large (>50 Mpc) clustering-dominated scales making it the first LIM experiment that will place constraints on the SFR-to-$L_{[CII]}$ and the halo-to-galaxy SFR relations simultaneously.

17 pages, 10 figures, Accepted for publication in A&A

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Cited by in corpus (4)

• Line-Intensity Mapping: Theory Review
• CONCERTO: High-fidelity simulation of millimeter line emissions of galaxies and [CII] intensity mapping
• [CII] line intensity mapping the epoch of reionization with the Prime-Cam on FYST
• Revisiting the [C II]${}_{158\mu \text{m}}$ line-intensity mapping power spectrum from the EoR using non-uniform line-luminosity scatter